Effect of electron temperature on small-amplitude electron acoustic solitary waves in non-planar geometry

Abstract

Effects of electron temperature on the propagation of electron acoustic solitary waves in plasma with stationary ions, cold and superthermal hot electrons is investigated in non-planar geometry employing reductive perturbation method. Modified Korteweg–de Vries equation is derived in the small amplitude approximation limit. The analytical and numerical calculations of the KdV equation reveal that the phase velocity of the electron acoustic waves increases as one goes from planar to non planar geometry. It is shown that the electron temperature ratio changes the width and amplitude of the solitary waves and when electron temperature is not taken into account,our results completely agree with the results of Javidan & Pakzad (2012). It is found that at small values of $\tau$, solitary wave structures behave differently in cylindrical ($\text {m} = 1$), spherical ($\text {m} = 2$) and planar geometry ($\text {m} = 0$) but looks similar at large values of $\tau$. These results may be useful to understand the solitary wave characteristics in laboratory and space environments where the plasma have multiple temperature electrons.